LWN.net's Journal
 
 [Most Recent Entries] [Calendar View]

Wednesday, July 21st, 2021

    Time Event
    1:35p
    Rosenzweig: Reverse-engineering the Mali G78
    Alyssa Rosenzweig goes into the details of the reverse-engineering of the Mali "Valhall" GPU instruction set.

    Valhall linearizes Bifrost, removing the Very Long Instruction Word mechanisms of its predecessors. Valhall replaces the compiler’s static scheduling with hardware dynamic scheduling, trading additional control hardware for higher average performance. That means padding with “no operation” instructions is no longer required, which may decrease code size, promising better instruction cache use.

    A document describing the instruction set has been released, along with an assembler and disassembler.

    2:59p
    Security updates for Wednesday
    Security updates have been issued by Arch Linux (ant, code, dino, firefox-ublock-origin, go, libuv, nextcloud-app-mail, nodejs-lts-erbium, nodejs-lts-fermium, openvswitch, putty, racket, telegram-desktop, and wireshark-cli), Debian (kernel, linux-4.19, and systemd), Fedora (kernel, kernel-headers, kernel-tools, and krb5), Gentoo (systemd), Mageia (perl-Convert-ASN1 and wireshark), openSUSE (caribou, containerd, crmsh, fossil, icinga2, kernel, nextcloud, and systemd), Red Hat (389-ds:1.4, glibc, java-1.8.0-openjdk, java-11-openjdk, kernel, kernel-rt, kpatch-patch, libldb, perl, RHV-H, rpm, shim and fwupd, and systemd), Slackware (kernel), SUSE (caribou, containerd, crmsh, curl, dbus-1, kernel, qemu, and systemd), and Ubuntu (binutils, linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux, linux-aws, linux-aws-5.8, linux-azure, linux-azure-5.8, linux-gcp, linux-gcp-5.8, linux-hwe-5.8, linux-kvm, linux-oracle, linux-oracle-5.8, linux-raspi, linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon, linux, linux-aws, linux-azure, linux-gcp, linux-gke-5.3, linux-hwe, linux-lts-xenial, linux-kvm, linux-oracle, linux-raspi, linux-raspi2-5.3, linux-oem-5.10, nvidia-graphics-drivers-390, nvidia-graphics-drivers-418-server, nvidia-graphics-drivers-450-server, nvidia-graphics-drivers-460, nvidia-graphics-drivers-460-server, nvidia-graphics-drivers-470, and systemd).
    9:21p
    [$] The Sequoia seq_file vulnerability
    A local root hole in the Linux kernel, called Sequoia, was disclosed
    by Qualys     on July 20. A full system compromise is possible until
    the kernel is patched (or mitigations that may not be fully effective are applied). At
    its core, the vulnerability relies on a path through the kernel where
    64-bit size_t values are "converted" to signed integers, which effectively
    results in an overflow. The flaw was reported to Red Hat on June 9,
    along with a local
    systemd
    denial-of-service vulnerability    , leading to a kernel crash, found at the same time.
    Systems with untrusted local users need updates for both problems applied as soon as
    they are available—out of
    an abundance of caution, other systems likely should be updated as well.

    << Previous Day 2021/07/21
    [Calendar]     		Next Day >>

LWN.net   About LJ.Rossia.org